Design test plans and test cases
Prepare test executions
Execute tests and report bugs, then follow up on them
Manual functional testing on web applications
System and integration testing, mostly via UI, with some API testing
Regression testing
Review and validate requirements in various formats (documents, tickets, designs)
Estimate and prioritize testing tasks
Collaborate and communicate with all team members and stakeholders
Follow Agile methodologies (mostly Scrum)
Learn and apply new techniques and best practices